Process for producing raised dull-finish prints.



ANTON J. NEMEC, OF CHICAGO, ILLINOIS.

PROCESS FOR PRODUCING RAISED DULL-FINISH PRINTS.

No Drawing.

To all 211710172 it may concern Be it known that I, ANTON J. NEMEO, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a Process for Producing Raised Dull-Finish Prints, of which the following is a specification.

In a print taken from a lithographic plate or type-form, the impression is glossy and is substantially flush with the surface of the paper. It has been proposed to impart to such a print the appearance of having been produced by means of embossing dies, by sprinkling powdered varnishing material upon the impression while wet, and subjecting the print to suiiicient heat to dissolve the powder and incorporate it with the ink. The result of this process is to impart such thickness to the design as to give it the ap pearance of having been produced by the embossing process, and by reason of the na ture of the powdered material the finished print is glossy or lustrous.

My invention contemplates the production of a print having the appearance of a copper-plate print, but having a dull or rough finish. By reason of such finish, the print may be read more easily and with less strain upon the eyes than is the case with ordinary letter-press or lithographic prints or the lustrous prints produced by the above mentioned imitation-embossing process.

In carrying out my invention, the print may be produced in the usual manner upon a common type-form or lithographic printing press. Immediately after the print has left the press, and while the impression is still wet, I apply to the print a readily-reducible composition in the form of a dry powder. The powder may be applied to the print in any suitable manner, either manually or by the aid of machinery, and the surplus powder which does not adhere to the ink may be removed in any suitable manner before the print is exposed to heat.

While the ingredients of the reducible composition may be varied, I have obtained satisfactory results by the use of a composition consisting of a carbohydrate; a reducing agent; an ingredient to impart body to the print: and an ingredient which by melting in the ink assists in incorporating the Specification of Letters Patent.

Application filed March 5, 1913.

Patented J an. 5, 1915. Serial No. 752,234.

other ingredients with the ink. The carbohydrate may be ordinary powdered or confectioners sugar or starch. The reducing agent may be sulfur. The ingredient to give body to the print may be alum. The fusible ingredient may be a hydrocarbon such as naphthalene (C H which is a solid at room temperature. In order to render the composition dry and pulverulent, and thus facilitate its handling and application to the print, a quantity of lycopodium may be added to the mixture. \Vhen used, the lycopodium also acts to hasten the reduction of the carbohydrate.

The following composition has been found satisfactory, the proportion being stated by volume; naphthalene, one part, sulfur, three parts, sugar, two parts, lycopodium, onehalf part, and alum, two parts. I wish to have it understood, however, that these pro portions may be varied. The alum may be replaced with other material which will give body to the print. Lycopodium may be replaced by ordinary starch.

The function of the naphthalene in the composition is to dissolve in the ink and thus facilitate incorporation of the other ingredients in the ink, whereby the color of the ink is imparted to the whole and to the finished print. In many cases the finished print is slightly darker in color than the original print.

hen the composition, in the form of a dry powder, is applied to the wet imprint, the powder adheres to the imprint. The print is then subjected to heat, as by passing it through a heated chamber. The heat causes the naphthalene to dissolve in the ink, and the sulfur and lycopodium cause almost instantaneous reduction of the carbohydrate and, probably, of a portion of the ink, the result being a raised, rough, dullfinish print.

. The degree of heat employed and the length of time during which the print is subjected to heat should be such that the composition will be reduced and the print dried sufiiciently so that the ink will not offset when the sheets are piled upon one another. The shorter the length of time during which the print is exposed to heat, the

higher the temperature which may be safely employed. The temperature and time of Cfi exposure should also be properly propor- -tioned with respect to the character of the sheets being operated upon, and also with regard to the color of the ink or the desired color of the finished imprint.

It will be understood that variations in Copies 0! this patent may be obtained for five cents each, by addressing the Washington, D. 0.

the former involves reduction of the materials rather than simple fusion thereof.

I claim as my invention:

1. The process of producing a raised dullfinish print consisting of producing an imprint, applying a readily-reducible material to the imprint while wet, and subjecting said material to heat sufiicient to reduce the same.

2. The process of producing a raised dullfinish print consisting of producing an im print, applying a reducible material to the imprint, and subjecting said material to heat sufficient to reduce the same.

In testimony whereof Iaffix my signature in the presence of two witnesses.

ANTON J. NEMEO.

WVitnesses:

C. J. CHRISTOFFEL, GEORGE L. CHINDAHL.

Commissioner of Patents. 

